#!/usr/bin/env bash

# Script intended to be executed from ncmpcpp (execute_on_song_change
# preference) running from urxvt to set album cover as background image
MPD_CONF=~/.config/mpd/mpd.conf
MUSIC_DIR=$(cat "$MPD_CONF" | grep -v '#' | grep 'music_directory' | cut -d ' ' -f2 | awk '{print $2}' | sed 's/"//g')
DARKEN=70

TMP=/tmp
COVER=/tmp/cover.jpg
IMG_REG=".*/.*\(Front\|front\|Cover\|cover\|Art\|art\|Folder\|folder\).*[.]\(jpe?g\|png\|gif\|bmp\)"

function reset_background() {
	# is there any better way?
	printf "\e]20;;100x100+1000+1000\a"
}

{
	album="$(mpc --format %album% current)"
	artist="$(mpc --format %artist% current)"
	file="$(mpc --format %file% current)"
	dir="$MUSIC_DIR/$artist/$album"
	if [[ -d "$dir" ]]; then
		album_dir="$dir"
	else
		album_dir="$MUSIC_DIR/${file%/*}"
	fi

	[[ -z "$album_dir" ]] && exit 1

	covers="$(find "$album_dir/" -type d -exec find {} -maxdepth 1 -type f -regex "$IMG_REG" \;)"
	src="$(echo -n "$covers" | head -n1)"
	darkenimg="$TMP/darken.jpg"
	rm -f "$COVER" "$darkenimg"
	if [[ -n "$src" ]]; then
		light="$((100 - $DARKEN))"
		convert "$src" -fill "gray${light}" +level ${light}%,${light}% \
			+matte "$darkenimg"
		composite "$darkenimg" -compose Multiply "$src" "$COVER"
		if [[ -f "$COVER" ]]; then
			printf "\e]20;${COVER};100x100+50+50:op=keep-aspect\a"
		else
			reset_background
		fi
	else
		reset_background
	fi
} &
